fuel rail pressure

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    Negative Desired Fuel Rail Pressure

    Hello, I have a 2008 6.6L LMM drivetrain with 140k miles (it is a converted 2007 suburban 2500). When I accelerate hard the fuel rail demand is dropping to a negative number, in the attached example it goes from about 9k demand to -8k demand. I also noticed that even in WOT the demand never...
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